the oldest living former u.s. president made headlines in retirement skydiving to celebrate recent birthdays. how do you feel, mr. president? >> i feel wonderful! >> reporter: several months ago he was at the white house for the unveiling of his son's official presidential portrait. >> i am honored to be hanging near a man who gave me the greatest gift possible unconditional love that would be number 41. >> reporter: in recent years bush has developed a form of parkinson's disease that makes it difficult to walk. family spokesman says this latest illness has taken its toll. >> the president looks like he's done a few rounds with mike tyson. >> reporter: still doctors are cautiously optimistic about his treatment. even though he was on a liquid diet the elder bush was able to join his family for a christmas meal. they are hopeful he can turn things around. adriana diaz for cbs news. >>> had the ceo of facebook is being called out about privacy concerns. his older sister says a private photo was tweeted by a woman s